What are the key points in the operation of dissolving dyes in high temperature and high pressure dyeing?

1. Check the accuracy of the prepared dyes and chemicals according to the prescription list. When disperse dyes are used to make materials, generally use cold water to beat them and mix them evenly (stirring with a mixer for about 20-30 minutes), and then dilute them with warm water at 40～45°C before use.

2. Dispersing agent and leveling agent should be boiled and stirred evenly with warm water, and should be used as needed.

3. When encountering difficult dyes such as Disperse Red 3B, Disperse rubine S-2GFL, etc., beat and stir in cold water, and dilute with warm water.

4. The feeding sequence is to add acetic acid at about 40°C, run for a while, adjust the PH value to 5-6, add dye, run for 10 minutes, dye according to the predetermined heating curve. If there is too much foam in the machine after feeding, in order to avoid damaging the circulation pump, reducing the head or even floating the fabric, a defoamer should be added in time.